"How ever did you see
that?"
"Because I looked for it."
"Wonderful!" said the counlry doctor. "You are certainly
right, sir. Then a third shot has been fired, and therefore a third
person must have been present. But who could that have been,
and how could he have got away?"
"That is the problem which we are now about to solve," said
Sherlock Holmes. "You remember, Inspector Martin, when the
servants said that on leaving their room they were at once
conscious of a smell of powder, I remarked that the point was an
extremely important one?"
"Yes, sir; but I confess I did not quite follow you."
"It suggested that at the time of the firing, the window as well
as the door of the room had been open. Otherwise the fumes of
powder could not have been blown so rapidly through the house.
A draught in the room was necessary for that. Both door and
window were only open for a very short time, however."
"How do you prove that?"
"Because the candle was not guttered."
"Capital!" cried the inspector. "Capital!"
"Feeling sure that the window had been open at the time of
the tragedy, I conceived that there might have been a third
person in the affair, who stood outside this opening and fired
through it.
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